Improvement in key-hole guards



CHARLES B. DAVIE S, OF DAYTON, O I-I IO.

Letters Patent No. 83,837, dated Nooember 10, 1868.

The Schedule referred to in thele Letters Patent and makln; part of thelame.

To whom it may concern": Y

Beit known that I, Onannns B. DAVIES, of Dayton, in the county ofMontgomery, and State of Ohio, have invented anew and useful Improvementin Lock-Guard and I do declare that the following is a true and accuratedescription thereof, reference being had to the accompanying ch'awings,and to the letters of reference marked thereon, and being a partof thisspecification.

Figure l is a plan view of adoor with my attachment;

Figure 2 is a sectional view of the cap.

Figure 3 is a sectional view of my attachment to a door.

Likeletters indicate like parts iii-each figure.

The nature of my invention consistsin constructing a neat, cheap, anddurable apparatus, to be'attached to any ordinary do0r-lock, to preventthe same from being picked from the outside. To accomplish this end, 1.construct a cap, A, of brass or any other suit able material and form,which is provided on its inner face with projecting stud B. O is aspring iigidLy secured to the stud, at or near'its outer end. On theinner side of cap A, and above stud B,is a perforation, provided with athread, and corresponding in size to the threaded bolt D, upon which isplaced thumb-screw E, working freely upon the same.

Having thus named the various parts of my invention, I will now describetheir uses, promising, however, that cap A is detached from bolt Placecap A against the outside of the door,stud B entering the elongatedportion of the key-hole, where it is held in position by the action ofspring C Close the door, lock the same, and remove the key,'then insert,from the inside, bolt D through the upper or round CHARLES B. DAVIESWitnesses J. W. Houen-rnnm, MAX. KUPPIUS.

